Zhu Wenqi, Agrawal Amit, Nahata Ajay
Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Opt Express. 2008 Apr 28;16(9):6216-26. doi: 10.1364/oe.16.006216.
We describe the experimental realization of planar plasmonic THz guided-wave devices using periodically perforated metal films. These perforated films behave as effective media for which the dielectric function can be broadly engineered. We initially use transmission measurements to measure the complex dielectric constants of these effective media and show experimentally that the effective plasma frequency corresponds to the cutoff frequency of the rectangular apertures. Using these structures, we demonstrate not only straight planar THz waveguides, but also more complex devices such as Y-splitters and 3-dB couplers. In each of these embodiments, we demonstrate that the propagating THz radiation is well confined in both the in-plane and out-of-plane axes. This approach opens exciting new avenues for both passive and active THz guided-wave devices and circuits.
我们描述了使用周期性穿孔金属膜实现平面等离子体太赫兹导波器件的实验方法。这些穿孔膜表现为有效的介质，其介电函数可以进行广泛的设计。我们首先使用透射测量来测量这些有效介质的复介电常数，并通过实验表明有效等离子体频率对应于矩形孔的截止频率。利用这些结构，我们不仅展示了直线型平面太赫兹波导，还展示了更复杂的器件，如Y型分离器和3分贝耦合器。在每个实施例中，我们都证明了传播的太赫兹辐射在面内和面外轴上都得到了很好的限制。这种方法为无源和有源太赫兹导波器件及电路开辟了令人兴奋的新途径。
